Effect of polishing versus glazing of CAD-CAM ceramics on wear and surface roughness of opposing composite resin

Abstract

Background: This study aimed to assess the effect of polishing versus glazing of computer‑aided
design‑computer‑aided manufacturing (CAD‑CAM) ceramics on depth of wear and surface
roughness of opposing composite resin.
Materials and Methods: This in vitro study was conducted on 40 Z250 composite and 40
CAD‑CAM ceramic specimens including Celtra Duo, Vita Mark II, e.max CAD, and Vita Suprinity
ceramics. All ceramic specimens were roughened by a fine‑grit bur after primary glazing to simulate
an adjusted surface in the clinical setting. They were then randomly assigned to two subgroups and
underwent reglazing or polishing. All composite and ceramic specimens underwent profilometry
after surface treatment and prior to the wear test, and the results were recorded quantitatively.
Composite specimens were then subjected to 120,000 wear cycles against ceramic specimens in a
chewing simulator, and the depth of wear was measured by a scanner. Data were statistically analyzed
by repeated measures two‑way analysis of variance (ANOVA) and one‑way ANOVA (α = 0.05).
Results: Comparison of the surface roughness of composite specimens before and after the wear
test revealed significant differences in both glazed Suprinity (P = 0.048) and Vita Mark II (P = 0.026)
ceramics groups. The change in surface roughness after the wear test (compared with baseline) was
significant in glazed (P = 0.000) and polished (P = 0.013) Vita Mark II and polished Suprinity (P = 0.037)
ceramics, but this change was not significant in other ceramics (P > 0.05). The depth of wear after
the wear test was not significantly different among the ceramic and composite subgroups (P > 0.05).
Conclusion: Assessment of depth of wear and surface roughness of composite specimens showed
that the polishing kits of CAD‑CAM ceramics can serve as a suitable alternative to reglazing.
Key Words: Composite resins, computer‑aided design, dental restoration wear

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Mina Sadat Khoramian Esfahani: Pubmed,Google Scholar